Question

Question 60.Three pipes A, B and C can fill a tank from empty to full in 30 minutes, 20 minutes, and 10 minutes respectively. When the tank is empty, all the three pipes are opened. A, B and C discharge chemical solutions P,Q and R respectively. What is the proportion of the solution R in the liquid in the tank after 3 minutes?

• A. (a) 5/11
• B. (b) 6/11
• C. (c) 7/11
• D. (d) 8/11

Answer 1

The correct option is B

(b) 6/11

Answer 60. (b)
Explanation:
Part filled by (A + B + C) in 3 minutes = 3*1/30 + 1/20 + 1/10 = 3*11/60 = 11/20.
Part filled by C in 3 minutes = 3/10.

Required ratio =(3/10 * 20/11) = 6/11 .